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有O(sqrt(n))

Posted by twilight at 2009-05-27 17:08:39 on Problem 2853 and last updated at 2009-05-27 17:08:49
In Reply To:利用公式可以达到O(n)…… Posted by:wenzhixin at 2009-04-08 00:40:50
> 利用(2*a1+n-1)*n/2这条公式可以达到O(n)

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